The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2012
Filed:
Apr. 18, 2008
Jeffrey P. Rudd, Foxboro, MA (US);
Levi G. Fox, Charlestown, MA (US);
David Malcom Howie, Foxboro, MA (US);
Thomas A. Mignone, North Falmouth, MA (US);
James Pellegrini, Milbury, MA (US);
Jeffrey P. Rudd, Foxboro, MA (US);
Levi G. Fox, Charlestown, MA (US);
David Malcom Howie, Foxboro, MA (US);
Thomas A. Mignone, North Falmouth, MA (US);
James Pellegrini, Milbury, MA (US);
Illinois Tool Works Inc., Glenview, IL (US);
Abstract
A capacitive touch switch suitable for use in areas with high environmental and electrical contamination employs a complex excitation signal that is demodulated to better distinguish it from environmental effects. Improved discrimination allows these sensed signals to be offset against a signal developed by a reference electrode to allow the system to operate robustly with contamination on the electrodes that would otherwise trigger or obscure pulses.